Myself I I tend to draw the line for what counts as a reasonable cancellation gripe at three seasons or whenever the original main plotline resolves. Anything after that counts as simple discontinuation (since you can't cancel something that's not already planned to happen.)

Definitely agree with Firefly and Veronica Mars. At least we got a movie out of each of them (with Veronica Mars' film being released sometime next year). This article also makes a passing reference about Dark Horse being interested in doing an ongoing Firefly comic book series, which I've heard a couple of times before. Anyone know if they are still planning on doing that?

Eh, if you came to VM after it was done and watched it all in rapid sucession, like I did, the decline in quality was apparent in later seasons. I get that the network wanted to have more accessible storylines that didn't go on for a whole season... but that was what made S1 the masterpiece that it was.